一、<b >一</b><b >.</b><b>选择题</b>
-
-
2.
已知两个具有线性相关关系的变量的一组数据(x
1 , y
1),(x
2 , y
2),…,(x
n , y
n),由这些数据得到的回归直线l的方程为
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmover+accent%3D%22true%22%3E%3Cmi%3Ey%3C%2Fmi%3E%3Cmo%3E%5E%3C%2Fmo%3E%3C%2Fmover%3E%3C%2Fmath%3E)
=
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmover+accent%3D%22true%22%3E%3Cmi%3Eb%3C%2Fmi%3E%3Cmo%3E%5E%3C%2Fmo%3E%3C%2Fmover%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmover+accent%3D%22true%22%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmo%3E%5E%3C%2Fmo%3E%3C%2Fmover%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
,若
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmover+accent%3D%22true%22%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmo%3E%C2%AF%3C%2Fmo%3E%3C%2Fmover%3E%3C%2Fmath%3E)
=
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmi%3En%3C%2Fmi%3E%3C%2Fmfrac%3E%3Cmunderover%3E%3Cmstyle+mathsize%3D%22140%25%22+displaystyle%3D%22true%22%3E%3Cmo%3E%E2%88%91%3C%2Fmo%3E%3C%2Fmstyle%3E%3Cmrow%3E%3Cmi%3Ei%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmi%3En%3C%2Fmi%3E%3C%2Fmunderover%3E%3Cmsub%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmi%3Ei%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
,
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmover+accent%3D%22true%22%3E%3Cmi%3Ey%3C%2Fmi%3E%3Cmo%3E%C2%AF%3C%2Fmo%3E%3C%2Fmover%3E%3C%2Fmath%3E)
=
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmi%3En%3C%2Fmi%3E%3C%2Fmfrac%3E%3Cmunderover%3E%3Cmstyle+mathsize%3D%22140%25%22+displaystyle%3D%22true%22%3E%3Cmo%3E%E2%88%91%3C%2Fmo%3E%3C%2Fmstyle%3E%3Cmrow%3E%3Cmi%3Ei%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmi%3En%3C%2Fmi%3E%3C%2Fmunderover%3E%3Cmsub%3E%3Cmi%3Ey%3C%2Fmi%3E%3Cmi%3Ei%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
,则下列各点中一定在l上的是( )
A . (
,
)
B . (
,0)
C . (0,
)
D . (0,0)
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3.
已知函数f(x)=x3﹣x+2,则曲线y=f(x)在点(1,f(1))处的切线方程是( )
A . 4x﹣y﹣2=0
B . 4x﹣y+2=0
C . 2x﹣y=0
D . 2x﹣y﹣3=0
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4.
某学生通过计算发现:21﹣1=12能被12整除,32﹣1=2×22能被22整除,43﹣1=7×32能被32整除,由此猜想当n∈N*时,(n+1)n﹣1能够被n2整除.该学生的推理是( )
A . 类比推理
B . 归纳推理
C . 演绎推理
D . 逻辑推理
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5.
已知随机变量ξ的分布如下:
ξ | 1 | 2 | 3 |
P | | 1﹣ | 2a2 |
则实数a的值为( )
A . ﹣
或﹣
B .
或
C . ﹣
或
D .
或﹣
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6.
(
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsup%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsup%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmi%3Ex%3C%2Fmi%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
)
6的展开式的中间一项为( )
A . ﹣20x3
B . 20x3
C . ﹣20
D . 20
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7.
在两个分类变量的独立性检验过程中有如下表格:
P(K2≥k0) | 0.50 | 0.40 | 0.25 | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 |
k0 | 0.455 | 0.708 | 1.323 | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 |
已知两个分类变量X和Y,如果在犯错误的概率不超过0.05的前提下认为X和Y有关系,则随机变量K2的观测值可以位于的区间是( )
A . (0.05,0.10)
B . (0.025,0.05)
C . (2.706,3.841)
D . (3.841,5.024)
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-
9.
若m,n∈N* , 且n≥m,则下列说法正确的是( )
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10.
函数f(x)=
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmrow%3E%3Cmo%3E%7B%3C%2Fmo%3E%3Cmrow%3E%3Cmtable%3E%3Cmtr%3E%3Cmtd%3E%3Cmrow%3E%3Cmrow%3E%3Cmo%3E%7C%3C%2Fmo%3E%3Cmrow%3E%3Cmi%3El%3C%2Fmi%3E%3Cmi%3En%3C%2Fmi%3E%3Cmi%3Ex%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmo%3E%7C%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmi%3E++%EF%BC%8C+%3C%2Fmi%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmi%3E%26lt%3B%3C%2Fmi%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmo%3E%E2%89%A4%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmtd%3E%3C%2Fmtr%3E%3Cmtr%3E%3Cmtd%3E%3Cmrow%3E%3Cmrow%3E%3Cmo%3E%7C%3C%2Fmo%3E%3Cmrow%3E%3Cmi%3El%3C%2Fmi%3E%3Cmi%3En%3C%2Fmi%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmsup%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsup%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmo%3E%7C%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmi%3E++%EF%BC%8C+%3C%2Fmi%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmi%3E%26gt%3B%3C%2Fmi%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmtd%3E%3C%2Fmtr%3E%3C%2Fmtable%3E%3C%2Fmrow%3E%3C%2Fmrow%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
,则函数g(x)=f(x)﹣1的零点个数为( )
A . 1
B . 2
C . 3
D . 4
二、<b >二</b><b >.</b><b>填空题</b>
-
11.
i是虚数单位,a,b∈R,若
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmrow%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmn%3E3%3C%2Fmn%3E%3Cmi%3Ei%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmi%3Ei%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
=bi,则a﹣b=
.
-
12.
用数字1,2,3,4,5组成没有重复数字的5位数,其中2,4不相邻的数有个.
-
13.
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmunderover%3E%3Cmstyle+mathsize%3D%22140%25%22+displaystyle%3D%22true%22%3E%3Cmo%3E%E2%88%AB%3C%2Fmo%3E%3C%2Fmstyle%3E%3Cmrow%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmunderover%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
(3x
2+2x+1)dx=
.
-
14.
已知甲猜谜猜对的概率为
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmn%3E4%3C%2Fmn%3E%3Cmn%3E5%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
,乙猜谜猜对的概率为
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
.若甲、乙二人各猜一次谜,则恰有一人猜对的概率为
.
-
15.
若(2x﹣1)
6=a
1x
6+a
2x
5+a
3x
4+a
4x
3+a
5x
2+a
6x+a
7 , 则
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsub%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmsub%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsub%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmn%3E5%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmsub%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsub%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmsub%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
=
.
三、<b >三</b><b >.</b><b>解答题</b>
-
16.
已知i是虚数单位,a,b∈R,z1=a﹣1+(3﹣a)i,z2=b+(2b﹣1)i,z1=z2 .
-
-
(2)
若z=m﹣2+(1﹣m)i,m∈R,求证:|z+a+bi|≥
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
.
-
17.
某射击队有8名队员,其中男队员5名,女队员3名,从中随机选3名队员参加射击表演活动.
-
-
(2)
求选出的3名队员中女队员人数比男队员人数多的概率.
-
18.
5个人排成一排,要求甲排在中间,乙不排在两端,记满足条件的所有不同排法的种数为m.
-
-
(2)
求
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsup%3E%3Cmrow%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmi%3Ex%3C%2Fmi%3E%3C%2Fmsqrt%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmfrac%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmi%3Ex%3C%2Fmi%3E%3C%2Fmfrac%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmfrac%3E%3Cmrow%3E%3Cmn%3E3%3C%2Fmn%3E%3Cmi%3Em%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
的展开式的常数项.
-
19.
盒中有标号分别为0,1,2,3的球各一个,这些球除标号外均相同.从盒中依次摸取两个球(每次一球,摸出后不放回),记为一次游戏.规定:摸出的两个球上的标号之和等于5为一等奖,等于4为二等奖,等于其它为三等奖.
-
-
(2)
记完成一次游戏获奖的等级为ξ,求随机变量ξ的分布列和数学期望.
-
20.
已知函数f(x)=x4﹣2x3 , g(x)=﹣4x2+4x﹣2,x∈R.
-
-